WASHINGTON -- The Obama administration is weighing plans to detain some terror suspects on U.S. soil -- indefinitely and without trial -- as part of a plan to retool military commission trials that were conducted for prisoners held in Guantanamo Bay, Cuba.

The proposal being floated with members of Congress is another indication of President Barack Obama's struggles to establish his counter-terrorism policies, balancing security concerns against attempts to alter Bush-administration practices he has harshly criticized.